768
Q:

A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

A) 54 % B) 64 %
C) 74 % D) 84 %

Answer:   B) 64 %



Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3. 

 

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5 

Then, error = (5x/3 - 3x/5) = 16x/15 

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

In a certain experiment the count of bacteria was increasing at a rate of 2.5% per hour. Initially the count was 512000.  Find the count of bacteria at the end of two hours.

 

A) 533000 B) 537920
C) 673895 D) 670000
 
Answer & Explanation Answer: B) 537920

Explanation:
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0 40
Q:

Mridula runs a small pet shop. Her expense distribution is given as: 90% in procurement and 10% in paying rents and electricity. If she spends Rs. 15,000 on rent and electricity on a monthly basis. then how much does she spend every month in procurement?

 

A) ₹ 1.35 lakh B) ₹ 4.5 lakh
C) ₹ 5 lakh D) ₹ 2 lakh
 
Answer & Explanation Answer: A) ₹ 1.35 lakh

Explanation:
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0 66
Q:

20% of 60 is 25% of .........

 

A) 36 B) 30
C) 40 D) 48
 
Answer & Explanation Answer: D) 48

Explanation:
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0 295
Q:

The price of cooking oil increased by 25%. Find by how much percentage a family must reduce its consumption in order to maintain the same budget?

 

 

 

A) 70% B) 80%
C) 30% D) 20%
 
Answer & Explanation Answer: D) 20%

Explanation:
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0 196
Q:

A has thrice as much amount as that of B and B has 40% more amount than C. If the average of the amount of all three of them is Rs 1320, then what amount (in Rs) A has?

 

A) 2410   B) 2520  
C) 2250   D) 3240
 
Answer & Explanation Answer: B) 2520  

Explanation:
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5 330
Q:

18% of 60 is 54% of __.

A) 40 B) 30
C) 20 D) 180
 
Answer & Explanation Answer: C) 20

Explanation:
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5 325
Q:

A jeweller made a piece of uniquely designed diamond necklace and the selling price was fixed at Rs.10,00,000. In making this piece, on the raw material, the jeweller had invested Rs.3,00,000 and had paid a labour charge of Rs.2,00,000. If 20% of the raw material cost was of gold, what is the actual amount the jeweller had spent in procuring the gold?

 

A) Rs. 1,60,000 B) Rs. 1,08,000
C) Rs. 3,60,000 D) Rs. 60,000
 
Answer & Explanation Answer: D) Rs. 60,000

Explanation:
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0 1441
Q:

If Anju scored 68 out of 80 in Hindi, 46 out of 60 in Mathematics, 74 out of 90 in Science, and 34 out of 45 in English, in which subject did Anju score the maximum percentage marks?

A) Mathematics B) Hindi
C) Science D) English
 
Answer & Explanation Answer: B) Hindi

Explanation:
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0 177